Scale tower



FIG. 1 is a front elevational view of a scale tower showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines are for purposes of illustration only and form no part of the claimed design. 

The ornamental design for a scale tower, as shown and described. 